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参数资料
| 型号： | LTC2215CUP |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | ADC |
| 英文描述： | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| 封装： | 9 X 9 MM, PLASTIC, MO-220WNJR-5, QFN-64 |
| 文件页数： | 18/36页 |
| 文件大小： | 1703K |
| 代理商： | LTC2215CUP |
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LTC2216/LTC2215
25
22165f
The internal programmable gain amplier provides the
internal reference voltage for the ADC. This amplier has
very stringent settling requirements and therefore is not
accessible for external use.
The SENSE pin can be driven ±5% around the nominal 2.5V
or 1.25V external reference inputs. This adjustment range
can be used to trim the ADC gain error or other system
gain errors. When selecting the internal reference, the
SENSE pin should be tied to VDD as close to the converter
as possible. If the sense pin is driven externally it should
be bypassed to ground as close to the device as possible
with 1μF ceramic capacitor.
Figure 7. A 2.75V Range ADC with
an External 2.5V Reference
VCM
SENSE
1.575V
3.3V
2.2μF
1μF
22165 F07
LTC1461-2.5
2
6
4
LTC2216/
LTC2215
3. If the ADC is clocked with a xed-frequency sinusoidal
signal, lter the encode signal to reduce wideband
noise.
4. Balance the capacitance and series resistance at both
encode inputs such that any coupled noise will appear
at both inputs as common mode noise.
The encode inputs have a common mode range of 1.2V
to VDD. Each input may be driven from ground to VDD for
single-ended drive.
Driving the Encode Inputs
The noise performance of the LTC2216/LTC2215 can
depend on the encode signal quality as much as on the
analog input. The encode inputs are intended to be driven
differentially, primarily for noise immunity from common
mode noise sources. Each input is biased through a 6k
resistor to a 1.6V bias. The bias resistors set the DC oper-
ating point for transformer coupled drive circuits and can
set the logic threshold for single-ended drive circuits.
Any noise present on the encode signal will result in ad-
ditional aperture jitter that will be RMS summed with the
inherent ADC aperture jitter.
In applications where jitter is critical (high input frequen-
cies), take the following into consideration:
1. Differential drive should be used.
2. Use as large an amplitude possible. If using trans-
former coupling, use a higher turns ratio to increase the
amplitude.
Figure 8. Equivalent Encode Input Circuit
LTC2216/LTC2215
22165 F08
ENC–
ENC+
1.6V
6k
TO INTERNAL
ADC CLOCK
DRIVERS
VDD
Figure 9. Balun-Driven Encode
50Ω
100Ω
8.2pF
0.1μF
T1
T1 = MA/COM ETC1-1-13
RESISTORS AND CAPACITORS
ARE 0402 PACKAGE SIZE
50Ω
22165 F09
ENC–
ENC+
LTC2216/
LTC2215
APPLICATIONS INFORMATION
相关PDF资料 |
PDF描述 |
|---|---|
| LTC2216CUP#TR | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| LTC2216IUP#TR | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| LTC2216IUP | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| LTC2216CUP | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| LTC2215IUP | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2215CUP#PBF | 制造商:Linear Technology 功能描述:IC ADC 16BIT 65MSPS 64-QFN |
| LTC2215CUP#TRPBF | 制造商:Linear Technology 功能描述:IC ADC 16BIT 65MSPS 64-QFN |
| LTC2215CUP-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Bit, 80Msps/65Msps Low Noise ADC |
| LTC2215CUP-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Bit, 80Msps/65Msps Low Noise ADC |
| LTC2215CUP-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Bit, 80Msps/65Msps Low Noise ADC |
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